Your jeans fit differently, even though you have not changed what you eat. Your skin looks different — drier, perhaps, or less firm. Your joints ache in the morning in a way they never did before. Your hair has changed texture. You feel like a stranger in your own body, and nobody seems to have a satisfying explanation. Here is the honest hormonal explanation for what is happening — and why it is not a failure of willpower or self-care.
The Oestrogen Effect on Your Body
Oestrogen receptors exist in virtually every tissue in the body — skin, bone, brain, heart, joints, gut, bladder, and hair follicles. When oestrogen levels begin to fluctuate and decline during perimenopause, the effects are felt everywhere simultaneously. This is why perimenopause can feel like your entire body is changing at once — because, in a very real sense, it is.
The Changes and Why They Happen
Weight Gain and Body Shape Changes
Most women gain 2–5kg during perimenopause, with fat redistributing from hips and thighs to the abdomen. This is not simply about eating more or moving less — it is a direct effect of declining oestrogen on fat cell distribution and metabolic rate. Oestrogen also helps regulate insulin sensitivity; as it declines, blood sugar regulation becomes less efficient, making weight management harder even with the same diet and exercise habits.
Skin Changes
Oestrogen stimulates collagen production and maintains skin hydration. As oestrogen declines, collagen production slows — studies show women lose approximately 30% of skin collagen in the first 5 years after menopause. The result: skin becomes drier, thinner, less elastic, and more prone to sensitivity. Many women also notice increased facial hair and changes in skin texture.
Joint and Muscle Pain
Oestrogen has significant anti-inflammatory properties and helps maintain joint lubrication. Its decline can cause new or worsening joint pain, stiffness (particularly in the morning), and muscle aches. This is often misdiagnosed as early arthritis or fibromyalgia. Many women find that these symptoms improve significantly with hormone therapy.
Hair Changes
Hair thinning and texture changes are common in perimenopause. Oestrogen prolongs the growth phase of the hair cycle; as it declines, hair may become finer, grow more slowly, or shed more than usual. Simultaneously, the relative increase in androgens (as oestrogen declines) can cause increased facial and body hair in some women.
Skin Sensitivity and Formication
Some women experience a crawling or tingling sensation on the skin (formication), increased sensitivity to touch, or a feeling of burning or itching. These are neurological symptoms caused by oestrogen's role in nerve function and are often dismissed or misdiagnosed.
✅ ✅ Good news: Many of these physical changes respond well to hormone therapy, particularly when started early in perimenopause. Skin, hair, joint, and body composition changes can all improve with oestrogen replacement.
What You Can Do
Understanding that these changes are hormonal — not simply the result of ageing or lifestyle — is the first step. The second is getting an accurate assessment of your symptoms and discussing your options with a knowledgeable healthcare provider. Use our free Perimenopause Symptom Checker to assess your symptoms and generate a report for your GP.